Any quilt can become a scrappy, but we use the string, nine patch variations for a lot of our charity quilts. My favorite though is to take a bin of squares, at least 2 1/2 inches in size and just start sewing them together. The only time I allow myself to color match is if the two squares that i am sewing togther are the same color. I start with twos that become fours, that become 8's to 16's, then I start putting the squares together. I have also used a panel that has several various size blocks in it that I cut apart and added borders to make them divideable with the size squares that I have used and placed them randomly in the quilt.